Yellow-pine chipmunk records stretch from Mount Rainier and the North Cascades east toward the Palouse and Turnbull, while Olympic National Park supplies a western outlying group of reports. The breadth of named sites documents observer encounters across Washington; it does not show equal occupancy or density among them.
Reports occur throughout the year but are most frequent from June through September, when chipmunks are active and mountain routes are accessible. The warm-season rise belongs to the observation record, not to an abundance survey.
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